1 882.] Geology and Paleontology. 523 



articulate with the scaphoid, while in the Perissodactyla \t sustains 

 the scaphoid, while the lunar rests extensively on the unci- 

 form. As compared with the three groups named, Phenacodus 

 stands intermediate between the Amblypoda and the Proboscidca, 

 and agrees with the Hyracoidea in the slight posterior articulation 

 of the unciform with the lunar bone. The peculiar carpus charac- 

 teristic of the Perissodactyla is seen in the genera Triplopns and 

 Hyrachyus, and in the older Hyracotherium, which is the cotem- 

 porary of Phenacodus. There seems to be no sufficient ground 

 for separating the latter from the Proboscidea as a full order, so I 

 combine the two groups in one, under the name of Taxeopoda. 



The Taxeopoda is the primitive type of Ungulata in having the 

 carpal and tarsal bones arranged in linear series. In the more 

 specialized orders of Perissodactyla and Artiodactyla, the second 

 series of these bones has been rotated inwards one place. The 

 Amblypoda has the fore foot of the primitive type, and the hind 

 foot of the more specialized type. 



The group of Ungulata, whatever rank it may have, will then 

 be divided into the following orders or sub-orders : 



I. Os magnum supporting os lunare, and not articulating with os scaphoideum. 



^tragalus ginglymoid distally ; two median digits equal Artiodactyla. 



The Taxeopoda are naturally divided into two sub-orders, the 

 Proboscidea and Condylarthra, as follows . 



A pos lg lenoid C pr,,;' t , .L, ",'nl' ', ,'hiVd' \ " i. h" "uei of' 'tl.eVcmur ;' 'no c' 

 fibul * Condylarthra. 



It is probable that the Toxodontia form a third division of the 

 taxeopoda. It is also probable that the Hyracoidea should be 

 reduced to the position of a subdivision of the Taxeopoda— E. D. 

 tope. 



Geological News.— In the Geological Magazine for March, 

 fur' S ' Lucas discusses the age of the Headen Beds of the Isle 

 ot Wight, and M. J. E. Lee notes a peculiarity in the structure of 

 •a ncraspidean plate found in the Eifel. This plate shows a repe- 

 tition of the usually supposed outer corrugated layer, oneof which 

 ^Placed between two honey-comb layers, and an absence of the 

 ofth ° US la>er ' thus throwin S some doubt u P on the received order 

 ^e occurrence of these layers. Mr. E. T. Newton gives a list 

 seventeen species of fishes, the remains of which have been 



